Chimney-thimble



2 Sheets-Sheet 1.

(No Medel.)

0.1". GREEN.

GHIMNEY THIMBLE. Ne. 450,355. Petented Apr. 14,1891.

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(No Model. 2 sheets-she@ z.

C. F. GREEN. GHIMNEY THIMBLB.

No. 450,355. Patented Apr. 14, 18917.'-

` iJ'NITED STATES PATENT ENCE.

CHARLES F. GREEN, OF WORCESTER, MASSACHUSETTS.

CHIMNEY-THIMBLE.

SPECIFICATION forming part f Letters Patent No. 450,355, dated April 14, 1891.

4Application filed February 1ll 1889. Serial No. 299|421. (No model.)

To all whom it may concern:

Be it known that I, CHARLES F. GREEN, of

` the city and county of Vorcester, and State of Massachusetts, have invented certain new and useful Improvements in Chimney-Thimbles; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, forminga part of this spccication, and in which- Figure l represents a front View of my improved chimney-thimble fitted in position for use preparatory to plastering. Fig. 2 is a central vertical section through the parts shown in Fig. 1 after the plaster is applied, taken on line a of said Fig. 1. Fig. 3 is a detached side view of the thimble; and Figs. 4 and 5 are a front and side View, respectively, of said thimble, showing modifications in the construction thereof hereinafter described.

My invention relates to chimney-thimbles made from artificial stone, fire-clay, and similar substances. The object thereof is to attain certain improvements upon and not now possessed by the chimney-thimble patented to me in the United States under date of June l5, 1886, No. 343,581; and it consists in providing the front face of the thimble with a series of grooves or indentations to produce an irregular broken surface and in forming transverse corrugations or grooves in its outer side surfaces,-where it fits into the chimney, as well as other minor improvements hereinafter more fully set forth.

In order that others may better understand the nature and purpose of my said invention, I will now proceed to .describe it more in detail.

In. the drawings, A represents part of the chimney; B, the thimble;4 C, the studding; D, the lathing, and E the plastering.

Heretofore considerable obj ection has been made to my aforesaid patented thimbles on account of the plaster not properly adhering to the faces thereof and because the side surfaces were made straight in an unbroken line from their inner ends out, thus producing a straight joint through which fire might possibly work from the chimney and ignite the wood-work around the thimble; and to obviate these objections is the main object of my invention. I obviate the first of the above ting the thimble in position, and thus more eftectually interrupt the passage of lire, as aforesaid. The broken front surface may be obtained by forming a series of grooves or channels b in the thimble, extending in various directions over said surface by means of irregular rock-face indentations c, as 1ndicated in Figs. 4 and 5, or by vermiculated and similar rough surfaces, the essential point being to produce a surface in this class of thimbles whereon the plaster after having been applied will adhere closely, in like manner to that applied to the lathing around the same.

I prefer in practice to form a rim or collar d on the face of the thimble around its opening to plaster against, and also to make said opening :Haring or beveled, with the inner end the largest, so as to carry off any moisture upon the inside down into the chimney, 1nstead of passing out at the front end of the thimble. y

In my former patent previously referred to I have shown a bevel e upon the front top edge, and the lath and plaster are made to come in alignment therewith, so that in case of settlement the plastering above the thimble will be bulged or forced out at the top of said thimble only, instead of all around the same, as usual. The bevel is designed for the same purpose in the present instance; but instead of extending it across the top only it is carried entirely around the thimble, as is shown in Figs. 1 and 4, for the purpose of fan cilitating the operation of fitting said thimbles in position, the thimble being made square with its opening at the center, and consequently being immaterial which side comes at the top in setting the same. This feature of carrying the bevel entirely around the thimble is found to be of considerable advantage over my old form of thimbles in practice. I expect no protection thereon, however, except in combination with my other improvements. f Although I prefer the'square form of thimble shown, I do not limit myself thereto, as

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my invention is equally applicable to thimbles made round or of polygon shape in crosssection.

The grooves or corrugations f, formed upon the outer surface of the thimble at its inner end Where said thimble fits into the chimney A, may be made of various shapes to accomplish the desired result previously specified, and I therefore do not limit myself to any1 particular shape.

In Figs. 2 and 3 I have shown a doublecurved recess, While in Eig. 5 two grooves with beveled sides are shown, these being the shapes I prefer in practice. By thus corrugating or grooving the thimble at this point it is obvious that when the mortar is properly pressed into said corrugations or grooves, as is indicated in Fig. 2, it is next to an impossibility for fire to Work its way through around said thimble. Said construction, as will be apparent, also serves to securely hold the thiinble in position. Consequently a tight joint is always maintained and the liability to fire correspondingly reduced, in addition to the above-described provision for effecting said result. I

Having described my invention, what I claim therein as new, and desire to secure by Letters Patent, is-

l. A chiinney-thimble made of one piece of artificial stone or similar material, having an opening therethrough, a roughened face, and

a rirn or collar around the outer end of the opening, the said face being flat, except at its outer margin, Where it is beveled, substantially as and for the purpose set forth.

2. A chimneythimble made of one piece of artificial stone or similar material, having corrugations or grooves around the surface of the inner end thereof, an opening therethrough, a roughened face, and a rim or collar around the outer end of the opening, the said face being flat, except at its outer margin, Where it is beveled, substantially as and for the purpose set forth.

3. A chimney-thimble made of one piece of artificial stone or similar material, having a tapering opening therethrough, a roughened face, and a riin or collar around the outer end of the tapering opening, the said face being fiat, except at its outer margin, Where it is beveled, substantially as and for the purpose set forth.

et. A chimney-thimble made of one piece of artificial stone or similar material, having corrugations or grooves around the surface of the inner end thereof, a tapering opening therethrough, a roughened face, and a rim or collar around the outer end of the tapering opening, the said face being flat, except at its outer margin, where it is beveled, substantially as and for the purpose set forth.

CHARLES F. GREEN.

lNitgnesses:

A. A. BARKER, W. B. NoURsE. 

